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Income Taxes - Textual (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Operating Loss Carryforwards [Line Items] |  |  |
Effective tax rate | 24.10% | 22.70% | 21.80%
Federal statutory rate | 21.00% | 21.00% | 21.00%
Net operating loss carryforwards | $ 42.2 | $ 44.1 |
Deferred Tax Assets, Valuation Allowance | 14.8 | $ 17.9 |
Home Building | State [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Net operating loss carryforwards | 11.9 |  |
Home Building | State [Member] | NOL Carryforwards to Expire in One to Ten Years [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Net operating loss carryforwards, subject to expiration | 4.5 |  |
Home Building | State [Member] | NOL Carryforward to Expire in Eleven to Twenty Years [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Net operating loss carryforwards, subject to expiration | 7.4 |  |
Forestar Group [Member] | State [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Net operating loss carryforwards | $ 1.0 |  |

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